Patent GB-561181-A (GB)
Title: Method of and means for providing an adhesive surface on a part of a flexible web such as paper
IPC: B65H23/04
Filed: 1942-08-24
Abstract: 561,181. Feeding webs. WOOD NEWSPAPER MACHINERY CORPORATION. Aug. 24, 1942, No. 11907. Convention date, Oct. 9, 1941. [Class 100 (i)] [Also in Group VIII] Comprises a method and apparatus for producing rolls of web material such as paper of the kind described in Specification 555,707 in which a section of the web adjacent its inner core end is provided with an adhesive such as a non-vulcanizing rubber cement for the purpose of splicing the tail end of an expiring roll to the leading end of a new roll without interrupting the feed of paper &c. to a printing or other web-consuming machine. The rolls are formed in succession from a web travelling continuously from a master roll 8 or a paper machine having drying rolls 7 and calender rolls C by means of a roll winding device R comprising a driven under-roller 14 co-operating with cores 15, 16 on which the successive rolls are wound, and the apparatus is so arranged that each time the moving web is transferred to a fresh core 16 to start a new roll, the adhesive is applied to the web in the form of a thin sheet of paper, regenerated cellulose or cellulose derivative bearing a dried coating of the required adhesive on one surface and a tacky adhesive on the other surface, which is pressed on to the web. An adhesive repellent coating such as wax may be applied to the opposite face of the web to ensure that the adhesive-' coated coils do not stick together. The sheet 30 of paper, regenerated cellulose &c. bearing the adhesive coating is removably held. e.g. by easily frangible gummed tabs, or a weak adhesive, on a large, light-weight drum 33 with the adhesive surface inwards and is coated on the outside surface with a tacky adhesive for securing the sheet to the web. When roll 15 is nearly completed, and it is time to start a new roll, the drum 33 is connected to the driving mechanism by a clutch 34<1> so that it attains a surface speed equal to that of the web 9, and a push button switch 42 is closed and held for an interval. Thereafter, as soon as a conducting segment 53 on the shaft of the drum 33 engages a stationary contact 54 connected with wire 48, two electrical circuits are simultaneously completed, the position of the segment 53 being such that the circuits are completed when the bare part 50 of the drum is opposite the web. Completion of one circuit energizes solenoid 39 and thereby causes the web to be pressed upwards against the surface of the rotating drum 33 and to peel therefrom the sheet 30, the upward movement being caused by roller 35 which is raised by a pneumatic device 36 to which air is admitted through valve 38 controlled by the solenoid. Completion of the other circuit energizes solenoid 41, which operates valve 40 admitting compressed air to nozzles 27, 28 which sever the web and start the severed end around the new core 16, and also connects wires 60, 61 through a contact 62 thus maintaining the other circuits complete after the conducting segment 53 leaves the stationary contact 54. A third circuit, which may also be completed, energizes solenoid 58 to operate a valve 59 admitting compressed air to a device 57 for spraying an adhesive repellent such as a solution of paraffin wax on to the reverse side of the web. The adhesive-repellent coating and the tacky adhesive securing the sheet to the web may be dried in a heated tunnel 49.